“莫兰蒂”台风暴雨的湿Q矢量和垂直螺旋度分析  

Analysis of wet ageostrophic Q-Vector and vertical helicity of rainstorm of typhoon “Meranti”(1614)

作　　者：韩芙蓉 鹿翔 梁亮 HAN Fu-rong;LU Xiang;LIANG Liang(Jinhua Meteorological Bureau,Jinhua 321000 China)

机构地区：[1]金华市气象局,浙江金华321000

出　　处：《海洋预报》2020年第1期67-74,共8页Marine Forecasts

基　　金：金华市科学技术研究计划公益类项目(2017-4-002)。

摘　　要：利用NCEP FNL再分析资料和中国自动站与CMORPH融合降水资料对1614号台风"莫兰蒂"进行了非地转湿Q矢量和垂直螺旋度诊断分析。对比非地转湿Q矢量散度和垂直螺旋度的三维结构可见,低层正垂直螺旋度与台风移动和强度变化相对应,可作为台风演变的动力因子。而综合考虑了动力和热力作用的非地转湿Q矢量在台风暴雨预报中作用更突出,其中低层700 hPa上的非地转湿Q矢量散度辐合值大于20×10^-16/(hPa·s^3)可作为台风暴雨落区和强度预报的重要参考量,其所对应的辐合区变化与台风暴雨落区变化有较好的对应关系,此外,湿Q矢量散度的三维结构反映了台风内部存在明显的中尺度对流系统,中尺度对流云团不断生消使得台风暴雨维持。Based on datasets of NCEP FNL and merged precipitation observed by China automatic meteorological station and CMORPH satellite, the characteristics of vertical helicity and wet ageostrophic Qvector of typhoon‘Meranti’(1614) are analyzed. Compared wet ageostrophic Q-vector with vertical helicity, the positive vertical helicity of the lower level corresponds to the movement and intensity of typhoon. It can be used as the dynamic factor to judge the evolution of of typhoon;while the wet ageostrophic Q-vector, considering of dynamic and thermal effects, can be used as a good factor in prediction of typhoon rainfall. The wet ageostrophic Q-vector of low-level shows well indication on typhoon rainfall, especially in 700 hPa. More than 20×10^-16/(hPa·s^3)of wet Q-vector in 700 hPa is an important reference for the area and the intensity of typhoon rainfall.Besides, the distribution of wet Q-vector reflects that amounts of mesoscale convective system exist in typhoon.

关 键 词：超强台风 台风暴雨 湿Q矢量 垂直螺旋度 

分 类 号：P458[天文地球—大气科学及气象学]